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680 Chesapeake Drive Redwood City,CA 94063 (650) 364-9600 rAX(650)364-9233 <br /> Q Sequoia 404 N_Wlget Lane Walnut Creek.CA 94598 (925)988-9600 FAX(925)988-9673 <br /> 819 Striker Avenue,Suite 8 Sacramento.CA 95834' (916)921-9600 FAX(916)921-0100 <br /> Analytical 1455 McDowell Blvd.North.Ste,D Petaluma.CA 94954 (707)792-1865 FAX(707)792.-0342 <br /> 1551 Industrial Road San Carlos,CA 940 70-4111 (650)232-9600 FAX(650)232.9612 <br />' ATC Associates, Inc. Client Project ID: Stkn USD Stagg High School <br /> 1117 Lone Palm Avenue <br /> Modesto, CA 95351-1502 <br />' Attention: Jeanne Homsey QC Sample Group: 9903044-01-02 Reported: Mar 11, 1999 <br /> QUALITY CONTROL DATA REPORT <br />' Matrix: Liquid <br /> Method: EPA 8015 <br />' Analyst: R.GECKLER <br /> ANALYTE Gasoline <br />' QC Batch#: GC030599BTEX31A <br /> Sample No.: 9902G66-2 <br /> Date Prepared: 315199 <br /> Date Analyzed: 315199 <br /> Instrument I.D.#: GCHP31 <br />' Sample Conc., uglL: N.D. <br /> Conc.Spiked,ug/L: 250 MATRIX EFFECTS <br /> Matrix Spike, ug/L: 210 <br /> % Recovery: 84 PRESENT <br /> Matrix <br /> pike Duplicate, ug/L: 330 <br />' % Recovery: 132 <br /> elative% Difference: 44 <br />' RPD Control Limits: 0-25 <br />' LCS Batch#: GC030599STEX31A <br /> Date Prepared: 315/99 <br />' Date Analysed: 315/99 <br /> Instrument I.D.#: GCHP31 <br /> Conc.Spiked, ug/L: 250 <br />' LCS Recovery, ug/L: 250 <br /> LCS% Recovery: 100.0 <br /> Percent Recovery Control Limits: <br /> MS/MSD 60-140 <br /> LCS 70-130 <br /> Quality Assurance Statement: All standard operating procedures and quality control requirements have been met. <br /> Please Note: <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br />' SEQUOIA ANALYTICAL preparation,and analytical methods employed for the samples. The matrix spike is an aliquot of sample <br /> fortified with known quantities of specific compounds and subjected to the entire analytical procedure. If <br /> the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> Kavan lmyai interference,the LCS recovery is to be used to validate the batch. <br />' <br /> Project Manager <br />